Nitrate
Edom Water Supply Corporation
Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 0.112 ppm | 2 | 2 | 0.0289 ppm - 0.195 ppm |
| 2019 | 0.111 ppm | 2 | 2 | 0.0364 ppm - 0.185 ppm |
| 2020 | 0.0953 ppm | 2 | 2 | 0.0236 ppm - 0.167 ppm |
| 2021 | 0.0319 ppm | 2 | 2 | 0.0293 ppm - 0.0344 ppm |
| 2022 | 0.0959 ppm | 2 | 2 | 0.0357 ppm - 0.156 ppm |
| 2023 | 0.152 ppm | 2 | 2 | 0.142 ppm - 0.162 ppm |
ppm = parts per million
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.14 ppm
The EWG health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.
EPA Maximum Contaminant
Level (MCL): 10 ppm
The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.
ppm = parts per million
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-04-02 | Q1813186009 | 0.0289 ppm |
| 2018-04-02 | Q1813186014 | 0.195 ppm |
| 2019-07-01 | Q1941197001 | 0.185 ppm |
| 2019-07-01 | Q1941197002 | 0.0364 ppm |
| 2020-02-03 | Q2004150004 | 0.0236 ppm |
| 2020-04-07 | Q2014329006 | 0.167 ppm |
| 2021-07-12 | Q2118055011 | 0.0293 ppm |
| 2021-07-12 | Q2118055012 | 0.0344 ppm |
| 2022-10-20 | Q2231923007 | 0.156 ppm |
| 2022-10-20 | Q2231923008 | 0.0357 ppm |
| 2023-08-30 | Q2337554009 | 0.162 ppm |
| 2023-08-30 | Q2337554010 | 0.142 ppm |